Abrading implement



P 1942- w. D. SEIGH 2,295,693

'ABRADING IMPLEMENT Filed Xpril 7, 1942 ll allza/ae A ttorneys PatentedSept. 15, 1942 UNITED STATES PATENT OFFICE ABRADING IMPLEMENT Wallace D.Selgh, Johnstown, Pa.

Application April 7, 1942, Serial No. 438,025

1 Claim.

My invention relates to improvements in abrading implements for dressingdown the screw threads of threaded dies and taps.

In the use of threaded dies and taps, it frequently occurs that there isa building up of foreign matter on the threads. Also, when the dies ortaps are ground, a burr or fin is sometimes left on the threads.

Having the foregoing in mind, it is the principal object of my inventionto provide a simply constructed, inexpensive and easily applied abradingimplement for dressing down such threads cleanly and quickly to removeburrs, fins, and the like'therefrom.

Other and subordinate objects are also comprehended by my invention, allof which, together with the precise nature of my improvements, will bereadily understood when the suc- .ceeding description and claim are readwith reference to the drawing accompanying and forming part of thisspecification.

In said drawing:

Figure 1 is a view in side elevation of my improved abrading tool in itspreferred embodiment. I

Figure 2 is a view in top plan,

Figure 3 is a view in transverse section taken on the line 3-3 of Figure1, and

Figure 4 is a view in perspective of the clamping plate.

Reference being had to the drawing by numerals, my improved implementinthe illustrated embodiment thereof comprises a handle I of barlike formand compound curvature for convenient gripping and which terminates inan elongated, substantially straight head 2 of rectangularcross-section. The bottom face of the head 2 is rab-beted to provide arectangular fiat bottomed socket 3 therein open at the sides of the headand having front and rear walls 4, 5 extending across said face at rightangles thereto.

Fitted in the described socket 3 to extend out of the same, below thehead 2, is a rectangular abrading, or grinding, member 6, preferably of,

The described abrading, or grinding, member 6 is detachably secured inthe socket 3 by the following means:

bore 1 I in a rectangular clamping plate I2 which is provided withbeveled front and rear sides I3 fitting in a. dovetail groove H in thetop face of the member 6 and extending transversely thereof.

Obviously, by tightening the set screw 9, the clamping plate l2 may bedrawn into wedging engagement with the side walls of the groove l4 toclamp the member 6 tight against the bottom of the socket} and therebyrigidly attach said member to said head 2. Conversely, by loosening theset screw 9, the clamping plate I! may be loosened in the groove It sothat the member 6 may be slid out of the socket 3 and another membersubstituted therefor.

In using the described implement, the ribs 8 are fitted into the threadsto be dressed and the implement reciprocated until the threads areproperly dressed down and cleaned.

The foregoing will, it is believed, sufiice to impart a clearunderstanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible of modificationwithout departing from the inventive concept, and right is hereinreserved to such modifications as fall within the scope of the subjoinedclaim,

What I claim is:

An abrading implement for dressing down screw threads comprising'abar-like handleterminating in a fiat bottomed head having a socket insaid bottom provided with front and rear walls extending at right anglesto said bottom, a rectangular abrading stone fitting in said socket andprovided with bottom ribs extending longitudinally of the implement andof V shape in cross-section for fitting between threads to be dressed,and means to detachably secure said stone in said socket, said meanscomprising a dovetail groove extending transversely across the top ofsaid stone, a clamping plate fitting in said groove and having bevelededges for wedging coaction with the sides of said groove underadjustment of the plate toward said head, and a set screw extendingthrough said head and threaded into the center of said plate foradjusting

